In message
,
Offramp writes

Mitcham Junction is a train and tram stop. A huge ramp has been built
there leading from the railway bridge down to the southbound platform.
It is not at the moment open to the public but I cannot imagine anyone
ever using it when it is opened. There is a recently resurfaced road
and pavement that lead straight to the same platform.

Is it this?
http://www.ctsbridges.co.uk/news/mitcham-junction-ramp/

Picture two-thirds of the way down:
http://www.ctsbridges.co.uk/news/
--
Paul Terry